<ul>
    <foreach name="ajax_tree_list" item="vo" key="k" >
    <li>
        <span class="tree_span" data-id="{$vo.user_id}">
        <i class="icon-folder-open"></i>
        {$vo.tree_id}:
        {$vo.user_name}
        </span>
    </li>
    </foreach>
</ul>
